From Irish 'Muirgheal' meaning 'bright sea,' combining 'muir' (sea) and 'geal' (bright).
Muriel is a name of ancient Celtic origin, most likely derived from the Old Irish muirgheal, a compound of muir (sea) and geal (bright) — meaning something close to "sea-bright" or "shining like the sea." It appeared in medieval Irish and Scottish Gaelic contexts as Muireall or Muirgheal before passing into Norman French as Muriel and from there into English usage after the eleventh century. The name carries the particular quality of Celtic compound names: it holds a small landscape within itself, a piece of light on moving water.
Muriel was documented among Norman families in England as early as the Domesday Book period, and it remained in circulation through the medieval era before fading into relative obscurity. It underwent a Victorian and Edwardian revival, reaching its peak popularity in Britain in the early twentieth century, when it had a slightly old-fashioned spinster reputation — a reputation the novelist Muriel Spark absolutely demolished. Spark, born in Edinburgh in 1918, was one of the great stylists of twentieth-century fiction; her novel The Prime of Miss Jean Brodie (1961) is a masterwork of irony, moral complexity, and indelible character.
Spark made the name glamorous by doing what great writers do: making it inseparable from unforgettable work. G. Wodehouse's comic universe and in various literary and dramatic contexts where it tends to carry a note of eccentric distinction.
The name's current position is poised: rare enough to feel genuinely unusual, yet anchored in a real Celtic heritage and a brilliant literary legacy. Parents who choose Muriel today are often drawn to its combination of antiquity, strangeness, and quiet luminosity.